Application of case hardening structural steel
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Operational advantages cemented layer
Cementation dramatically increases the hardness, fatigue strength and wear resistance of steels, which is achieved due to a sharp increase in percentage of carbides in the structure, as well as the creation of surface layers of residual compression stress (the presence of which the durability of the steels increases significantly).
Cementation is carried out in solid or gaseous carburization, and in the repair and manufacture method of carburizing in paste. Grouting is normally performed before quenching, but in some cases it may be combined with it.
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Examples of application
Hypereutectoid alloy steels subjected to carburizing in solid carburizer at temperature of 890…9200 C for 12 h 9… Then slow cooling of steels, and then followed by a second heating for hardening. This heating is carried out up to temperatures of 790…8200 C. thereafter the parts are cooled with water (showering) to temperatures of 100…1500С, and final cooling is performed in oil. The last operation in the workflow is the vacation at 150…1700 C. the carbon Content in the surface layers reaches 1.5…1.6% with the depth of the carbide rich zone 0.1…0.15 mm and hardness up to HRC 60…62.
Steel with a high chromium content are cemented in solid carburizer at 980…10200 C. the process Duration is 3…5 h, followed by quenching the steel in oil and tempering at 150…1800 C. When increasing the percentage content of carbon by 20…30% (and corresponding increase of hardness) and the toughness of such steels is reduced. It makes impossible their application in the nodes, which operate in conditions of high dynamic and shock loads.
Successfully lend themselves to grouting, high-chromium steel. For grouting use a solid carburizer (soda+charcoal). The process is conducted at 950…10000 C for 6 to 8 h. the Subsequent heat treatment includes quenching from 930…9600 C and a low supply (180…2000 C). The thickness of the thermally modified layer reaches 0.3…0.4 mm when the hardness of 60…65 HRC. The structure of the steel after carburizing — martensite with uniformly distributed carbides rounded shape. The core hardness is HRC 38…42.
The durability of structures, which are made of cemented steels, increases substantially.
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